Efficient and Nonhalogenated Solvent-Processed Organic Solar Cells Enabled by Conjugated Donor–Acceptor Block Copolymers Containing the Same Benzodithiophene Unit

• DOI: 10.1021/acsami.2c16908
• Publication Date: 2022-12-14T15:34:02Z
• Authors: Tan Ngoc-Lan Phan; Jin-Woo Lee; Eun Sung Oh; Seungjin Lee; Changyeon Lee; Taek-Soo Kim; Sheng Li; Bumjoon J. Kim
• Keywords: Acceptor; Thermal Stability

Organic solar cells (OSCs) based on conjugated block copolymers (CBCs) have gained considerable attention owing to their simple one-pot solution process. However, power conversion efficiencies (PCEs) require significant improvement. Furthermore, the majority of efficient CBC-based OSCs are processed using environmentally toxic halogenated solvents. Herein, we develop a new CBC (PBDB-T-b-PY5BDT) and demonstrate stable achieved by halogen-free We design (D1-A1)-b-(D1-A2)-type that shares same benzodithiophene (BDT) units in donor acceptor blocks. This alleviates unfavorable molecular interactions between blocks at interfaces. The PBDB-T-b-PY5BDT-based devices exhibit high PCE (10.55%), they show good mechanical, thermal, storage stabilities. Importantly, discuss potential our preparing two different control systems: one binary polymer blend (PBDB-T:PY5BDT) another random copolymer (CRC, PBDB-T-r-PY5BDT). photovoltaic performance, device stability, mechanical robustness exceed those all-polymer CRC-based OSCs.